MTG: Kaldheim Booster Box Art 9-pocket PRO Binder - Rules of Play says:

he Ultra PRO 9-pocket PRO-Binder stores and protects your collectible gaming cards while showcasing detailed, full-color key set art from the Kaldheim release of the highly popular trading card game Magic: The Gathering. Embossed low-friction black backing material gives cards a classic framed look. Side-loading pocket prevent cards from easily falling out in transit. Elastic strap holds the binder securely shut when not in use. All materials made from archival-safe, acid-free non-PVC materials. Holds 360 Cards in Ultra PRO Deck Protector sleeves.